She performed in over 80 films, 60 of the films from 1939 to 1964, and has appeared in over one hundred television productions from 1949 to 1975.
Bronson was married to the late Henry Daniels Mygatt on New Year's Day 1936; they divorced on May 7, 1943; they did not have children.
In 1943, Bronson appeared in the movie Happy Land as Mattie Dyer and on television in the episode "The Druid Circle" of The Philco Television Playhouse, that aired on March 6, 1949, in the role of Miss Dagnall.
Her final big screen appearance was in the film Kisses for My President (1964), in which she plays the part of Miss Currier.
She then appeared in a long series of minor characters for many television series episodes from the early days of television until the mid-1970s, including many western genres. She became widely known for her role as the grandmother in the Kings Row television series.
The original 1974 "Freeway Lady" mural had become victim to neglect by L.A. city officials, as a garage was built to obscure Bronson's bottom half and then a billboard company had whitewashed the image in 1986. Then, in 1995, while being repainted after a legal settlement, L.A.’s taggers killed off the Freeway Lady project with graffiti.
Bronson's final appearance on the small screen was as "Grandma Nussbaum", Fonzie's grandmother, in the episode "Fonzie Moves In" of the ABC-TV sitcom series Happy Days, which aired on September 9, 1975.
In 1994, a plan to rehang the mural outside the Valley Institute of Visual Arts in Sherman Oaks, California had died when a property owner refused to allow Twitchell access.
Bronson spent the last few years in Laguna Beach. She died in a San Clemente, California hospital on August 2, 1995.
In early 2016, after years of legal wrangling amidst offers from numerous vending suitors, Twitchell was finally successful in getting Los Angeles Valley College to approve an agreement to repaint his original "Lady of the Freeway" mural, with a $180,000 offer to recreate her courtesy of a voter-approved community colleges bond-building program.
